30022721 has 2 divisors, whose sum is σ = 30022722. Its totient is φ = 30022720.

The previous prime is 30022709. The next prime is 30022723. The reversal of 30022721 is 12722003.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28890625 + 1132096 = 5375^2 + 1064^2 .

It is a cyclic number.

It is not a de Polignac number, because 30022721 - 2¹⁴ = 30006337 is a prime.

Together with 30022723, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30022721.

It is not a weakly prime, because it can be changed into another prime (30022723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15011360 + 15011361.

It is an arithmetic number, because the mean of its divisors is an integer number (15011361).

Almost surely, 2^30022721 is an apocalyptic number.

It is an amenable number.

30022721 is a deficient number, since it is larger than the sum of its proper divisors (1).

30022721 is an equidigital number, since it uses as much as digits as its factorization.

30022721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 30022721 is about 5479.2993165185. The cubic root of 30022721 is about 310.8016746110.

Adding to 30022721 its reverse (12722003), we get a palindrome (42744724).

The spelling of 30022721 in words is "thirty million, twenty-two thousand, seven hundred twenty-one".